<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示信息区域 -->
      <el-alert title="注意:只允许为第三季分类设置相关参数" show-icon :closable="false" type="warning"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col><span>选择商品分类:</span><el-cascader
           v-model="selectedKeys"
           :options="cateList"
           :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children' }"
           @change="handleChange" placeholder="请选择商品具体分类" clearable></el-cascader></el-col>
      </el-row>
      <!-- tab标签页区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
          <!-- 添加动态参数的面板 -->
          <el-tab-pane label="动态参数" name="many"><el-button @click="addDialogVisible = true" :disabled="isBtnDisable" type="primary">
          添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data='manyTableDate' border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- tag标签 -->
                <el-tag closable v-for = "(item, i) in scope.row.attr_vals" :key="i" @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                <!-- 编辑文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 确定按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type='primary' icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" size="mini">修改</el-button>
                <el-button type='danger' icon="el-icon-delete"  @click="removeParams(scope.row.attr_id)" size="mini">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
          </el-tab-pane>
          <!-- 添加静态属性的面板 -->
          <el-tab-pane label="静态属性" name="only"><el-button @click="addDialogVisible = true" :disabled="isBtnDisable" type="primary">
          添加属性</el-button>
          <!-- 静态参数列表 -->
          <el-table :data='onlyTableDate' border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- tag标签 -->
                <el-tag closable v-for = "(item, i) in scope.row.attr_vals" :key="i" @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                <!-- 编辑文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 确定按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type='primary' icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" size="mini">修改</el-button>
                <el-button type='danger' icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" size="mini">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
          </el-tab-pane>
      </el-tabs><strong></strong>
    </el-card>
    <!-- 添加参数/属性对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数/属性对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择器数据双向绑定的数组
      selectedKeys: [],
      // 激活的Tab标签页名称
      activeName: 'many',
      // 动态参数列表数据
      manyTableDate: [],
      // 静态参数列表数据
      onlyTableDate: [],
      // 控制添加对话框显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 修改参数的表单数据对象
      editForm: {
        attr_name: ''
      },
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框显示与隐藏
      editDialogVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$msg.error('获取商品列表失败')
      }
      this.cateList = res.data
    },
    // 级联选择器变化事件
    handleChange () {
      this.getParamsData()
    },
    // tab页签点击事件
    handleClick () {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData () {
      // 选中的不是三级分类时
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        return ''
      }
      // 根据所选分类的ID和当前所处的面板获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$msg.error('获取商品参数失败')
      }
      // 将attr_vals的数据分隔成数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableDate = res.data
      } else {
        this.onlyTableDate = res.data
      }
    },
    // 监听添加参数对话框关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 监听修改参数对话框关闭事件
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$msg.error('参数不合法！添加失败')
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) {
          this.$msg.error('添加参数失败！')
        }
        this.$msg.success('添加参数成功！')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 打开修改参数对话框
    async showEditDialog (attrId) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(
            `categories/${this.cateId}/attributes/${attrId}`,
            {
              params: { attr_sel: this.activeName }
            }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 修改参数
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          this.$msg.error('修改参数信息失败！')
        }
        this.$msg.success('修改参数信息成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据ID删除对应的参数信息
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定删除',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消操作
      if (confirmResult !== 'confirm') {
        return this.$msg.info('已取消操作')
      }
      // 用户确定删除操作
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        this.$msg.error('删除参数失败')
      }
      this.$msg.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点或者按下回车键时触发
    handleInputConfirm (row) {
      // 当输入框中内容长度为0时(无效内容)重置文本框
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return ''
      }
      // 有效内容 进行添加操作
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 保存到数据库
      this.saveVals(row)
    },
    // 点击按钮展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 文本框自动获取焦点
      // 当页面被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除参数
    handleClosed (i, row) {
      row.attr_vals.splice(1, 1)
      this.saveVals(row)
    },
    // 发起请求将数据保存到数据库
    async saveVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
      if (res.meta.status !== 200) {
        return this.$msg.error('修改参数项失败')
      }
      this.$msg.success('修改参数项成功')
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisable () {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    // 获取当前三级分类的ID
    cateId () {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    // 根据激活的面板计算对话框标题
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_opt{
    margin-top:10px;
  }
  .el-tag{
    margin-right: 10px;
  }
  .input-new-tag {
    width: 150px;
  }
</style>
